21638980

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{41}}^1\times {\mathrm{2399}}^1$

素因数の和:2460

約数の個数: 48

約数和(自身を含む): 50803200

約数和(自身を除く): 29164220

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 41, 44, 55, 82, 110, 164, 205, 220, 410, 451, 820, 902, 1804, 2255, 2399, 4510, 4798, 9020, 9596, 11995, 23990, 26389, 47980, 52778, 98359, 105556, 131945, 196718, 263890, 393436, 491795, 527780, 983590, 1081949, 1967180, 2163898, 4327796, 5409745, 10819490, 21638980]

約数ペア:

[(1, 21638980), (2, 10819490), (4, 5409745), (5, 4327796), (10, 2163898), (11, 1967180), (20, 1081949), (22, 983590), (41, 527780), (44, 491795), (55, 393436), (82, 263890), (110, 196718), (164, 131945), (205, 105556), (220, 98359), (410, 52778), (451, 47980), (820, 26389), (902, 23990), (1804, 11995), (2255, 9596), (2399, 9020), (4510, 4798)]